Din Taper Pin

Taper Pin Din 1B in DubaiA taper pin is a fastener used in mechanical engineering. They are steel rods with one end having a slightly larger diameter than the other.
Some taper pins have a   on the small end that is designed to project through the hole and retain the pin with and a. Other pins are threaded on both ends, on the thick end to pull the pin out with the same nut that holds the pin in place.

This pin is a solid cylinder that starts at one diameter and tapers through its entire length to a slightly smaller diameter. Used to secure two items together, it is usually used with the small end diameter facing the ground, and the larger end pointing up